function PP(folder)
x1 = dlmread([folder,'ControllerModel1_plot.dat_x1.dat']);
x2 = dlmread([folder,'ControllerModel1_plot.dat_x2.dat']);
y  = dlmread([folder,'ControllerModel1_plot.dat_y.dat']);

mesh(x1,x2,y);
print('-djpeg',[folder,'costfun.jpg']);